⑦ Выполни действия: 7 2 a) 12 + 12 6)+17 24 24 B) 8 + 26 39+39

1. a) $$\frac{7}{12} + \frac{2}{12} = \frac{7+2}{12} = \frac{9}{12} = \frac{3}{4}$$
2. б) $$\frac{5}{24} + \frac{17}{24} = \frac{5+17}{24} = \frac{22}{24} = \frac{11}{12}$$
3. в) $$\frac{8}{39} + \frac{26}{39} = \frac{8+26}{39} = \frac{34}{39}$$

Ответ: а) 3/4; б) 11/12; в) 34/39